Progressive erosion of 90°elbow wall based on dynamic boundary
The fixed boundary wear prediction method can only obtain the wear characteristics under the initial boundary state of wear,and cannot obtain the dynamic response of the flow field after wall failure.A method for predicting the progressive erosion of the sandy water flow-passage walls with dy-namic boundary was proposed based on Computational Fluid Dynamics(CFD).The wall erosion mor-phology as well as the characteristics of flow field,erosion and particle impact of the 90°elbow at dif-ferent erosion times were studied.the multiphase flow characteristics and wear evolution mechanism caused by the evolution of the wear morphology of the flow passage wall were revealed.The results show that in a 90°elbow with an inflow velocity of 6.3 m/s and the particle volume fraction of 0.35%,the erosion is mainly concentrated near the end(50°-90°)of the inner wall.And after 20 000 hours,the average erosion rate of the outer inner wall and inner wall is increased to about 2 times.The distribution of particle impact velocity shows a law of increasing first and then decreasing,and the maximum chan-ges is 0.81 m/s.While the particle impact angle increases almost linearly,with an average maximum increase of 1.13°.Moreover,the impact velocity of particles in the erosion pits decreases,while the impact velocity at the edge of the erosion pit increases,indicating that the erosion range will further ex-pand with the increase of erosion time.The research results provide a reference for the erosion protec-tion of elbows.
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